US6796582B2 - Assembly consisting of an inflator, a housing and a retainer - Google Patents

Assembly consisting of an inflator, a housing and a retainer Download PDF

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Publication number
US6796582B2
US6796582B2 US10/195,658 US19565802A US6796582B2 US 6796582 B2 US6796582 B2 US 6796582B2 US 19565802 A US19565802 A US 19565802A US 6796582 B2 US6796582 B2 US 6796582B2
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Prior art keywords
inflator
tabs
retainer
housing
opening
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US10/195,658
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US20030020267A1 (en
Inventor
Markus Scholz
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TRW Occupant Restraint Systems GmbH
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TRW Occupant Restraint Systems GmbH
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Publication date
Application filed by TRW Occupant Restraint Systems GmbH filed Critical TRW Occupant Restraint Systems GmbH
Assigned to TRW OCCUPANT RESTRAINT SYSTEMS GMBH & CO. reassignment TRW OCCUPANT RESTRAINT SYSTEMS GMBH & CO. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCHOLZ, MARKUS
Publication of US20030020267A1 publication Critical patent/US20030020267A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/20—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
    • B60R21/217—Inflation fluid source retainers, e.g. reaction canisters; Connection of bags, covers, diffusers or inflation fluid sources therewith or together
    • B60R21/2171—Inflation fluid source retainers, e.g. reaction canisters; Connection of bags, covers, diffusers or inflation fluid sources therewith or together specially adapted for elongated cylindrical or bottle-like inflators with a symmetry axis perpendicular to the main direction of bag deployment, e.g. extruded reaction canisters

Definitions

  • the invention relates to an assembly consisting of a cylindrical inflator, a housing and a retainer by means of which the inflator can be fixed in the housing, the inflator featuring a longitudinal centerline L and a circumferential surface area.
  • Described in DE 296 04 345 U1 is one such assembly in which the inflator is fixed at its end by the retainer in the housing.
  • the shape of the retainer is specially adapted to the shape of the inflator head for reliable retention thereof. This means that when another inflator is employed the retainer need to be readapted. Apart from this, minor tolerances may result in play occurring between the retainer and the inflator, thus resulting in the inflator no longer being securely fixed in the housing.
  • an assembly consists of a cylindrical inflator, a housing and a retainer by means of which the inflator can be fixed in the housing.
  • the inflator has a longitudinal centerline and a circumferential surface area and the retainer comprises a circular opening with an edge. Protruding from the edge into the opening are tabs which engage the circumferential surface area of the inflator to fix the latter in the opening.
  • the inflator can be inserted through the opening in the retainer, it being clamped in place between the tabs to thus centering the inflator in the housing whilst preventing it from being radially displaced as well as rotationally displaced about its longitudinal centerline.
  • FIG. 1 is a longitudinal section through a first embodiment of the assembly in accordance with the invention
  • FIG. 2 is a view in perspective of the retainer of the assembly as shown in FIG. 1;
  • FIG. 3 is a front view of the retainer as shown in FIG. 2;
  • FIG. 4 is a cross-sectional view through the retainer as shown in FIG. 3 taken along the line IV—IV therein;
  • FIG. 5 is a side view of the retainer as shown in FIG. 2;
  • FIG. 6 is a cross-sectional view through the retainer as shown in FIG. 2 taken along the line IV—IV as shown in FIG. 5;
  • FIG. 7 is a cross-sectional view through the retainer as shown in FIG. 2 taken along the line VII—VII;
  • FIG. 8 is a cross-sectional view through the retainer as shown in FIG. 2 taken along the line VIII—VIII;
  • FIG. 9 is a cross-sectional view through the retainer as shown in FIG. 2 taken along the line IX—IX;
  • FIG. 10 is a cross-sectional view on a magnified scale of the portion X as shown in FIG. 9;
  • FIG. 11 is a cross-sectional view through a tab of a retainer in accordance with a second embodiment of the invention.
  • FIG. 1 there is illustrated a cross-sectional view through an assembly in accordance with the invention, consisting of an inflator 10 , a housing 12 and two retainers 14 .
  • the inflator 10 is a conventional cylindrical tubular inflator having a longitudinal centerline L and a shell forming a circumferential surface area 16 .
  • the inflator 10 has a first end 18 and a second end 20 , each of which is closed off by an end face 22 .
  • the shell of the inflator 10 protrudes by its ends 18 and 20 beyond the end face 22 and forms a rim 24 in each case.
  • the two retainers 14 are configured mirror-inverse and close off the housing 12 at the end faces.
  • One of the retainers is illustrated in FIG. 2 in perspective by way of example.
  • the retainer 14 which may be produced, for example, as a stamped part of sheet steel comprises a circular opening 26 , the radius R 0 of which is larger than the radius of the circumferential surface area 16 of the inflator 10 .
  • the opening 26 is defined by an edge 28 configured beaded for stiffening.
  • Extending into the opening 26 from the edge 28 are tabs 30 having a free end 32 and a base 34 by which they adjoin the edge 28 .
  • the tabs 30 are wider at the base 34 than at their free end 32 .
  • Their free end 32 is bent towards the longitudinal centerline L and forms a retaining lug 35 .
  • the tabs 30 are inclined towards the longitudinal centerline L. Thereby, the tabs 30 define a circle 36 of the opening, the radius R of which reduces towards the free end 32 (see FIGS. 6 to 10 ).
  • the largest radius R 0 of the opening circle 36 (FIG. 6) is larger than the radius of the circumferential surface area 16 of the inflator, whilst the smallest radius R 4 is smaller than the radius of the circumferential surface area 16 (FIG. 10 ).
  • the retainers 14 can be simply mounted by pushing the opening 26 onto the ends 18 and 20 of the inflator 10 in the housing 12 .
  • the tabs 30 inclined towards the longitudinal centerline L are elastically and plastically deformed, resulting in the inflator 10 being clamped in place at its rim 24 by the tabs 30 so that it is, on the one hand, centered in the housing 12 and, on the other, locked in place to prevent it turning about its longitudinal centerline L.
  • the retaining lugs 35 prevent any fore-and-aft displacement of the inflator 10 in the direction of its longitudinal centerline L.
  • the retainers 14 are additionally provided with fastener brackets 42 for securing the assembly in the vehicle.
  • the tabs 30 are curved, i.e. about an axis 1 which with the longitudinal centerline L includes an angle other than 0°.
  • the radius of curvature r of the tabs 30 increases towards the free end 32 so that the axis 1 is displaced.
  • the radius of curvature r 1 roughly corresponds to the radius R 1 of the opening circle 36 defined by the tabs, so that the axis 1 coincides with the longitudinal centerline L of the inflator 10 (FIG. 7 ), whereas at the free end 32 the radius of curvature r 4 is significantly larger than the radius R 4 of the opening circle 36 (FIG. 10 ).
  • the axes 1 of the various tabs define together a “quasi cone” about the longitudinal centerline L.
  • the vertex of this cone lies roughly in the plane of the section as shown in FIG. 7 on the axis L.
  • the cone has a diameter (indicated dot-dashed) which is defined by the spacing of the axis 1 from the longitudinal centerline L.
  • the diameter of the cone is even larger than in the section plane as shown in FIG. 8 .
  • FIG. 11 Another possibility of preventing the tabs 30 from biting into the rim 24 of the inflator 10 is illustrated in FIG. 11 .
  • the tabs 30 are bent at their edge.
  • the retainer 14 permits good compensation of tolerances in inflators differing in radius.
  • a further advantage materializes from the inflator being prevented from turning out of place about its longitudinal centerline L without this necessitating an additional element for positional fixing, for example, a nose engaging a groove in the inflator, thus enabling the inflator 10 to still be angularly positioned even during installation.
  • the retainers can also be used to advantage for assemblies including inflators differing in length.

Abstract

An assembly consisting of a cylindrical inflator , a housing and a retainer by means of which the inflator can be fixed in the housing. The inflator has a longitudinal centerline and a cirumferential surface area and the retainer comprises a circular opening with an edge. Protruding from the edge into the opening are tabs which engage the circumferential surface area of the inflator to fix the latter in the opening.

Description

TECHNICAL FIELD
The invention relates to an assembly consisting of a cylindrical inflator, a housing and a retainer by means of which the inflator can be fixed in the housing, the inflator featuring a longitudinal centerline L and a circumferential surface area.
BACKGROUND OF THE INVENTION
Described in DE 296 04 345 U1 is one such assembly in which the inflator is fixed at its end by the retainer in the housing. The shape of the retainer is specially adapted to the shape of the inflator head for reliable retention thereof. This means that when another inflator is employed the retainer need to be readapted. Apart from this, minor tolerances may result in play occurring between the retainer and the inflator, thus resulting in the inflator no longer being securely fixed in the housing.
It is the object of the invention to provide an assembly of the aforementioned kind permitting simple and universal means of locating the inflator in the housing.
BRIEF SUMMARY OF THE INVENTION
According to the invention, an assembly consists of a cylindrical inflator, a housing and a retainer by means of which the inflator can be fixed in the housing. The inflator has a longitudinal centerline and a circumferential surface area and the retainer comprises a circular opening with an edge. Protruding from the edge into the opening are tabs which engage the circumferential surface area of the inflator to fix the latter in the opening. The inflator can be inserted through the opening in the retainer, it being clamped in place between the tabs to thus centering the inflator in the housing whilst preventing it from being radially displaced as well as rotationally displaced about its longitudinal centerline.
Further advantageous embodiments of the invention will be apparent from the sub-claims.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a longitudinal section through a first embodiment of the assembly in accordance with the invention;
FIG. 2 is a view in perspective of the retainer of the assembly as shown in FIG. 1;
FIG. 3 is a front view of the retainer as shown in FIG. 2;
FIG. 4 is a cross-sectional view through the retainer as shown in FIG. 3 taken along the line IV—IV therein;
FIG. 5 is a side view of the retainer as shown in FIG. 2;
FIG. 6 is a cross-sectional view through the retainer as shown in FIG. 2 taken along the line IV—IV as shown in FIG. 5;
FIG. 7 is a cross-sectional view through the retainer as shown in FIG. 2 taken along the line VII—VII;
FIG. 8 is a cross-sectional view through the retainer as shown in FIG. 2 taken along the line VIII—VIII;
FIG. 9 is a cross-sectional view through the retainer as shown in FIG. 2 taken along the line IX—IX;
FIG. 10 is a cross-sectional view on a magnified scale of the portion X as shown in FIG. 9; and
FIG. 11 is a cross-sectional view through a tab of a retainer in accordance with a second embodiment of the invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to FIG. 1 there is illustrated a cross-sectional view through an assembly in accordance with the invention, consisting of an inflator 10, a housing 12 and two retainers 14. The inflator 10 is a conventional cylindrical tubular inflator having a longitudinal centerline L and a shell forming a circumferential surface area 16. The inflator 10 has a first end 18 and a second end 20, each of which is closed off by an end face 22. The shell of the inflator 10 protrudes by its ends 18 and 20 beyond the end face 22 and forms a rim 24 in each case.
The two retainers 14 are configured mirror-inverse and close off the housing 12 at the end faces. One of the retainers is illustrated in FIG. 2 in perspective by way of example. The retainer 14 which may be produced, for example, as a stamped part of sheet steel comprises a circular opening 26, the radius R0 of which is larger than the radius of the circumferential surface area 16 of the inflator 10. The opening 26 is defined by an edge 28 configured beaded for stiffening. Extending into the opening 26 from the edge 28 are tabs 30 having a free end 32 and a base 34 by which they adjoin the edge 28. The tabs 30 are wider at the base 34 than at their free end 32. Their free end 32 is bent towards the longitudinal centerline L and forms a retaining lug 35. Between their base 34 and their free end 32 the tabs 30 are inclined towards the longitudinal centerline L. Thereby, the tabs 30 define a circle 36 of the opening, the radius R of which reduces towards the free end 32 (see FIGS. 6 to 10). In this arrangement the largest radius R0 of the opening circle 36 (FIG. 6) is larger than the radius of the circumferential surface area 16 of the inflator, whilst the smallest radius R4 is smaller than the radius of the circumferential surface area 16 (FIG. 10). This is why the tabs 30 at the first end 18 and second end 20, respectively, the latter protruding through the opening 26 of the retainer 14, engage the rim 24 of the inflator 10.
In fitting the assembly the retainers 14 can be simply mounted by pushing the opening 26 onto the ends 18 and 20 of the inflator 10 in the housing 12. In so doing, the tabs 30 inclined towards the longitudinal centerline L are elastically and plastically deformed, resulting in the inflator 10 being clamped in place at its rim 24 by the tabs 30 so that it is, on the one hand, centered in the housing 12 and, on the other, locked in place to prevent it turning about its longitudinal centerline L. In addition, the retaining lugs 35 prevent any fore-and-aft displacement of the inflator 10 in the direction of its longitudinal centerline L.
The retainers 14 are additionally provided with fastener brackets 42 for securing the assembly in the vehicle.
Referring now to FIGS. 7 to 10 there is illustrated how the tabs 30 are curved, i.e. about an axis 1 which with the longitudinal centerline L includes an angle other than 0°. In this arrangement, the radius of curvature r of the tabs 30 increases towards the free end 32 so that the axis 1 is displaced. At the base 34 the radius of curvature r1 roughly corresponds to the radius R1 of the opening circle 36 defined by the tabs, so that the axis 1 coincides with the longitudinal centerline L of the inflator 10 (FIG. 7), whereas at the free end 32 the radius of curvature r4 is significantly larger than the radius R4 of the opening circle 36 (FIG. 10). This results in the contact surface area 38 between the tabs 30 and the rim 24 not being fixed at the edge of the tabs 30 but in the middle thereof. This produces less surface pressure in the region of the contact surface area 38 to thus prevent chipping of the rim 24 by the bite of the edge of the tabs 30. The axes 1 of the various tabs define together a “quasi cone” about the longitudinal centerline L. The vertex of this cone lies roughly in the plane of the section as shown in FIG. 7 on the axis L. In the plane of the section as shown in FIG. 8, the cone has a diameter (indicated dot-dashed) which is defined by the spacing of the axis 1 from the longitudinal centerline L. In the plane of the section as shown in FIG. 9, the diameter of the cone is even larger than in the section plane as shown in FIG. 8.
Another possibility of preventing the tabs 30 from biting into the rim 24 of the inflator 10 is illustrated in FIG. 11. In this case the tabs 30 are bent at their edge.
Due to the tabs 30 protruding into the opening 26 being plastically and elastically deformable, the retainer 14 permits good compensation of tolerances in inflators differing in radius. A further advantage materializes from the inflator being prevented from turning out of place about its longitudinal centerline L without this necessitating an additional element for positional fixing, for example, a nose engaging a groove in the inflator, thus enabling the inflator 10 to still be angularly positioned even during installation. The retainers can also be used to advantage for assemblies including inflators differing in length.

Claims (5)

What is claimed is:
1. An assembly comprising: a cylindrical inflator, a housing and a retainer fixing said inflator in said housing, said inflator featuring a longitudinal centerline and a circumferential surface area and said retainer comprising a circular opening with an edge, tabs protruding from said edge into said opening which engage said circumferential surface area of said inflator to fix the latter in said opening.
2. The assembly as set forth in claim 1, wherein said tabs are curved about an axis which is parallel to said longitudinal centerline.
3. The assembly as set forth in claim 2, wherein said tabs comprise a free end and a base at which they are connected to said edge of said opening, and wherein a radius of curvature of said tabs in the region of said base substantially corresponds to a radius of said circumferential surface area of said inflator.
4. The assembly as set forth in claim 3, wherein said radius of curvature of said tabs increases towards said free end.
5. The assembly as set forth in claim 3, wherein said free end of said tabs is bent towards said longitudinal centerline.
US10/195,658 2001-07-26 2002-07-15 Assembly consisting of an inflator, a housing and a retainer Expired - Lifetime US6796582B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE20112313.4 2001-07-26
DE20112313U 2001-07-26
DE20112313U DE20112313U1 (en) 2001-07-26 2001-07-26 Assembly of a cylindrical gas generator, housing and holding part

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US20030020267A1 US20030020267A1 (en) 2003-01-30
US6796582B2 true US6796582B2 (en) 2004-09-28

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130001930A1 (en) * 2011-06-29 2013-01-03 Toyoda Gosei Co., Ltd. Airbag apparatus for a front passenger's seat
US9992021B1 (en) 2013-03-14 2018-06-05 GoTenna, Inc. System and method for private and point-to-point communication between computing devices

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US7707255B2 (en) 2003-07-01 2010-04-27 Microsoft Corporation Automatic grouping of electronic mail
DE102004010144B4 (en) * 2004-02-27 2006-03-23 Zf Friedrichshafen Ag Arrangement for fixing the gas generator of an airbag unit
US8146016B2 (en) 2004-08-16 2012-03-27 Microsoft Corporation User interface for displaying a gallery of formatting options applicable to a selected object
US7703036B2 (en) 2004-08-16 2010-04-20 Microsoft Corporation User interface for displaying selectable software functionality controls that are relevant to a selected object
US8627222B2 (en) 2005-09-12 2014-01-07 Microsoft Corporation Expanded search and find user interface
DE102005049154A1 (en) * 2005-10-14 2007-05-31 GM Global Technology Operations, Inc., Detroit Gas generator for an airbag device, component set with such a gas generator and an airbag housing and method for producing an airbag device
US8484578B2 (en) 2007-06-29 2013-07-09 Microsoft Corporation Communication between a document editor in-space user interface and a document editor out-space user interface
US9665850B2 (en) 2008-06-20 2017-05-30 Microsoft Technology Licensing, Llc Synchronized conversation-centric message list and message reading pane

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US5456489A (en) 1994-06-15 1995-10-10 Morton International, Inc. Hybrid inflator adapter and secondary retainer
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US5511819A (en) 1995-03-27 1996-04-30 Morton International, Inc. Fastenerless automotive passenger airbag module endcap
DE29604345U1 (en) 1995-09-05 1996-07-18 Trw Repa Gmbh Airbag restraint module
DE19616940C1 (en) 1996-04-27 1997-07-24 Mst Automotive Gmbh Passenger airbag module in vehicle
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US5951042A (en) * 1997-11-06 1999-09-14 Trw Inc. Vehicle occupant protection apparatus
US6000718A (en) * 1997-03-06 1999-12-14 Automotive Systems Laboratory, Inc. End cap assembly for airbag inflator
US6095559A (en) * 1998-07-23 2000-08-01 Autoliv Asp, Inc. Chemical cooling of airbag inflation gases

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Publication number Priority date Publication date Assignee Title
US4394033A (en) * 1981-02-26 1983-07-19 The Firestone Tire & Rubber Company Temperature compensating elastic cone
DE4228232C2 (en) 1992-08-25 1995-09-07 Bayerische Motoren Werke Ag Airbag unit
US5456489A (en) 1994-06-15 1995-10-10 Morton International, Inc. Hybrid inflator adapter and secondary retainer
DE19533707A1 (en) 1994-09-19 1996-03-21 Trw Vehicle Safety Systems Airbag module
US5511819A (en) 1995-03-27 1996-04-30 Morton International, Inc. Fastenerless automotive passenger airbag module endcap
DE29604345U1 (en) 1995-09-05 1996-07-18 Trw Repa Gmbh Airbag restraint module
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US20130001930A1 (en) * 2011-06-29 2013-01-03 Toyoda Gosei Co., Ltd. Airbag apparatus for a front passenger's seat
US8641081B2 (en) * 2011-06-29 2014-02-04 Toyoda Gosei Co., Ltd. Airbag apparatus for a front passenger's seat
US9992021B1 (en) 2013-03-14 2018-06-05 GoTenna, Inc. System and method for private and point-to-point communication between computing devices

Also Published As

Publication number Publication date
DE20112313U1 (en) 2001-11-29
US20030020267A1 (en) 2003-01-30
DE10230725A1 (en) 2003-02-13
DE10230725B4 (en) 2015-07-30

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